Magnetization dynamics down to zero field in dilute (Cd,Mn)Te quantum wells

Mateusz Goryca

doi:10.1117/12.825066

18 August 2009 Magnetization dynamics down to zero field in dilute (Cd,Mn)Te quantum wells

Mateusz Goryca

Proceedings Volume 7398, Spintronics II; 739807 (2009) https://doi.org/10.1117/12.825066
Event: SPIE NanoScience + Engineering, 2009, San Diego, California, United States

Abstract

In this paper we describe the study of the magnetization dynamics after a short magnetic pulse, down to zero field and with a temporal resolution of a few ns, in (Cd,Mn)Te QWs with 0.2% to 1.5% Mn, and various densities of carriers. Short pulses of magnetic field were applied in the Faraday configuration by a small magnetic coil mounted at the surface of the sample. We analyzed the temporal evolution of the giant Zeeman shift of spectroscopic lines after the pulse with resolution down to a few nanoseconds. This evolution reproduces the dynamics of the magnetization of the Mn system. The dynamics in absence of magnetic field was found to be up to three orders of magnitude faster than that at 1 T. Hyperfine interaction and strain are mainly responsible for this fast decay. The influence of a hole gas is clearly visible: at zero field anisotropic holes stabilize the system of Mn ions, while in a magnetic field of 1 T they are known to speed up the decay by opening an additional relaxation channel.

Citation Download Citation

Mateusz Goryca "Magnetization dynamics down to zero field in dilute (Cd,Mn)Te quantum wells", Proc. SPIE 7398, Spintronics II, 739807 (18 August 2009); https://doi.org/10.1117/12.825066

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